Very recently Yasir Qadhi was asked about those Muslims who believe hijab is not mandatory for women. And he finally talked about slave women's awrah very briefly. What do you think of his answer?

At first he said that there is absolute ijma on the obligation of hijab, same thing which he said before.

Then he said that the critics would bring up the topic of milk yamin (ie slave women) being allowed to not cover their hair, and his response to that was there is ijma over the obligation of hair covering for free women, so therefore hijab is mandatory for the women today (because everyone today is a free woman).

What do you think of his answer?